Agree with most of what you're saying except

see them doggedly defend Biden for stiffing college debtors

Biden did more for college debtors than any president, ever. Did he entirely eliminate college debt? No. No one who was critically thinking actually thought that was going to happen, because what was probably going to happen was what ended up happening. A bunch of roadblocks got thrown in his way, including the Supreme Court. But he still eliminated many millions of dollars in college debt for a lot of people.

There's no doubt that the Democratic party is not particularly great at running campaigns. But that doesn't absolve the American populace from their duty to be reasonably informed. The Democratic party can run a dogshit campaign and people who are reasonably informed can still look at the hard data and see which party is a better bet for the economy and average Americans.

And to be clear, in a sane world, they did run a better campaign than the Republicans who ran on hate, fear, and absolute ridiculousness. IMMIGRANTS ARE EATING PEOPLE'S PETS IN SPRINGFIELD, OHIO.

That shit worked because Americans are pretty goddamn stupid. That's not the Democrat's fault, especially since they actually vote in favor of our educational system instead of trying to privatize it, like Republicans. The brunt of this shitshow we find ourselves in falls squarely on American voters and their lack of education/morals.